Assume the 8 greatest players of all-time faced off in a tournament similar to the current Year-End Championships (Round Robin stage consisting of 2 groups of 4, then semis and final). As usual, the winner of Group A would face the runner-up in Group B, and vice-versa.

In the group stage, everyone would play one match on each of the main tennis surfaces (traditional/fast grass, red clay and modern hardcourt).

The semi-final would be played on carpet.

The final would be played on the old wood surface.

Let's assume for simplicity that all these players used modern equipment and had modern training/diet etc. so could compete on a level playing field.

All matches are best of 5 sets.

Here are the round-robin stage groups:

Group A

Federer
Sampras
Borg
Rosewall

Group B

Laver
Gonzales
Nadal
Tilden

And here are the matches to be played:

Group A

Grass

Federer vs. Rosewall
Sampras vs. Borg

Clay

Federer vs. Borg
Sampras vs. Rosewall

Hard

Federer vs. Sampras
Borg vs. Rosewall

Group B

Grass

Laver vs. Tilden
Gonzales vs. Nadal

Clay

Laver vs. Nadal
Gonzales vs. Tilden

Hard

Laver vs. Gonzales
Nadal vs. Tilden

What would the results be? Who would emerge victorious from this tournament of giants???

__________________
Sloane Stephens and Laura Robson: future WTA world No 1 and 2.

Federer vs. Rosewall - Federer's serve, movement and power gets him through in 4.

Sampras vs. Borg - Sampras, takes this in 5. Tough match, lots of back and forth but Sampras is just that little bit better.

Clay

Federer vs. Borg - Borg takes this in 5, I think Federer is good enough to push Borg but I think in the edge Borg comes though. Federer wins the first set, then they exchange sets before Borg pulls away in the 5th.

Sampras vs. Rosewall - Rosewall, not much to say here. Rosewall is much better on clay...

Hard

Federer vs. Sampras - Federer, tough match but I think Federer wins this in 5.
Borg vs. Rosewall - Going to go with Borg maybe? They both have two YEC grade events right? I think excluding volley's Borg is probably superior to Rosewall from what I've read in other areas. So yeah Borg.
Group B

Group stages, keeping in mind all players in their ultimate, strongest form:Group A
Grass:
Federer vs Rosewall...Federer crushes in straight sets. 6-3, 6-1, 6-0. Tries to be humble in win, and offers golden purse to Rosewall as consolation prize.
Sampras vs Borg...Sampras in 4 sets. Both can play no doubt, but Sampras' serve proves to be very clutch and gets him much easier serve games...this ain't no Tanner
Clay:
Federer vs Borg...Borg in 5 sets ultimately wins due to better conditioning. Federer loses gracefully and still gets better crowd support.
Sampras vs Rosewall....Sampras brings big game to the table, but is chimp sliced to oblivion by Rosewall...Rosewall in 4 let's say
Hard:
Federer vs Sampras...Federer in 4 highly competitive sets...Sampras could have gotten it to 5, but Federer returns a mighty Sampras smash deep behind the base line with a curving, forehand smash lob in the 4th set tiebreaker
Borg vs Rosewall...Borg wins in 4. Rosewall puts up a fight, but Borg hurting from getting less crowd support in previous match tries to reach full flight and win convincingly. Rosewall's hits 85 mph backhand which hits Borg in balls...Borg keeps his cool and Rosewall apologizes, wasn't intentional

Federer and Borg advance to semi finals with 2-1 record. Sampras and Rosewall gave it a good effort though.

Group B
Grass:
Laver vs Tilden...Laver in 4...being generous and imagining Tilden to have a good serve by today's standards and somehow getting a set...by the the third set though, Laver veiny forehand is getting angry and he starts blasting Rockets left and right...a reporter asks after the match, if he feels he gave a better display of fire power than Federer in his embarrassing demolishing of Rosewall, Laver tries to be humble in victory and offers the reporter to go out drinking with him...Federer takes notes
Gonzales vs Nadal...Battle of intensity, but Nadal wins in 5...Milan had crushed Barcelona and Real Madrid in the semi finals and finals of Champions League and a furious Nadal unleashes his fury and passion towards Gonzales. Gonzales curses out Nadal midway through match after Nadal gets away with some illegal coaching. Tip Toni curses right back, camera catches the moment...and he is banned from attending the stadium for the rest of the tournament.
Clay:
Laver vs Nadal...Nadal in 3....Federer shows up before match and wishes Laver good luck and gives a menacing smile...Nadal furious for not having his coach/uncle/don in his box, delivers a triple bagel to Laver...at few points during the match, the spinny Rafito forehands fly over Laver's head. Laver calls this "most embarrassing moment of my career" but still invites reporter to go drinking...
Gonzales vs Tilden...Gonzales in 4. ****ed off he lost to Humbalito, Gonzales gives the performance of a life time...Tilden knowing he has lost two matches now goes and reads Nabokov's Lolita after the match
Hard:
Laver vs Gonzales: Laver in 5...the Rocket gets words of inspiration from fellow masterclass great Jan Kodes and gives a tough, but classy performance vs the great Gonzales...Federer invites Laver graciously to party with him and Robert Plant and Jimmy Page after the match.
Nadal vs Tilden...unbelievable, Nadal wins in 4...who writes this stuff? Nadal reaches semis with three straight sets...picking up steam now. Tilden heartbroken gets invited to the Elton John party afterwards, where he hits on George Michael...sparks fly...one thing leads to another...Tio Toni promises to give them any favor, as a wedding gift, and could be anything at all...he won't refuse...FBI watches on.

Semi finals
Fed finished first in his group in terms of sets and games won (both he and Borg won 2 matches) due to unbelievable demolition of fellow great Rosewall on grass.
So Federer plays Laver in the semi finals
Nadal plays Borg in the other semi
To be continued...

Semi finals (Carpet):
Federer vs Laver...greatest match in world history. Laver goes in as favorite due to better familiarity, but mountain powers and JoelDali's emotional blissful blessings guide the Eagle to new heights of soarness. Laver wins first two sets and leads 5-0 in the third...TMF, who is in the crowd, yells "you're Roger Federer, the GOAT!" Federer looks at Mirka in the crowd, Chris Evert in her box, tears running down her cheeks...meanwhile Navratilova laughs maniacally..time to step up and unleash full flight eagle mode! Motivated Fed breaks Laver's serve with a beautiful drop shot service return, score goes to 5-1.

A confused Laver thinks he'll be alright, but a legion of Federer fans and mountain gods are roaring their one, true hero to victory...Roddick who is in in the crowd too gets a bad feeling knowing what's about to come. Federer gets on a roll and draws the match 2-2 sets. Takes a perfectly legal bathroom break. As he returns he breaks Laver's serve, and before serving a crazed fan jumps from the stands and starts running towards wearing wearing an amateurishly made t-shirt with three 3 initials on it. N. S. K. Federer smacks him with the racquet, punk goes down and is escorted never to be seen again.

The final set Laver steps up and even gets match point, but Federer wins a crazy point with a between the legs shot. Next point Laver tries to be flashy and imitate the Great One but ends up hitting the wrong ball...Santoro laughs and says to world renowned forum tennis forum enthusiast and chess player Chopin, "I can beat this guy!" Laver loses that game, ultimately self sabotages himself into a loss (groin injury). Arrogant Federer wins match point via cheeky no look drop shot, that hits the end and lands on Laver's side...the gods were there that day indeed!

From Group B, Nadal and Gonzales go through? I think? Someone tell me if I'm wrong!

So...

Nadal vs Federer: On carpet Federer takes this, probably does it in no more than 4 sets.

Gonzales vs Borg: I reckon Borg wins this.

So the final is...

Federer vs Borg on wood. Never actually seen a match on wood. I will say that it goes to 5. The Federer fan in me wants to say he wins. But a Borg with modern training and raquets would be a beast. I'll say Borg carries the momentum of his round robin win through and wins.

As he returns he breaks Laver's serve, and before serving a crazed fan jumps from the stands and starts running towards wearing wearing an amateurishly made t-shirt with three 3 initials on it. N. S. K. Federer smacks him with the racquet, punk goes down and is escorted never to be seen again.

Maybe he hasn't, Federer's serve and forehand might be enough to take it.

Carpet, yeah he is a boss...wood? Hmmm

And btw since this is allowing all these greats to have same nutrition, modern technology and fitness, shouldn't we allow them same learning curve on all surfaces? Pretty sure wood was extinct before Rafito was even born so in this hypothetical Rafito should be allowed ample learning time on the surface, Tilden too for hard courts, etc